Portion of a tool housing



FIG. 1 is a perspective view of a portion of a tool housing according to my new design; and,

FIG. 2 is a right side elevation view thereof, the left side elevation view being a mirror image thereof, the top and bottom views being identical thereto, and the rear elevation view is unornamented and forms no part of the claimed design.

The broken lines shown herein are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a tool housing, as shown and described. 